Heronetta Management, L.P.

SEC CIK: 0001588225
Latest filing: Jul 28, 2026

SEC filings (opens in a new tab)

MPLX holding history

MPLX LP in every 13F filed by Heronetta Management, L.P., including the quarters it was sold out or no filing was made. Changes compare share counts with the previous calendar quarter.

MPLX overview All 13F holders of MPLX Full Q2 2026 holdings

Shares (Q2 2026): 324,039
Value: $18.3M
% of portfolio: 16.8%
Quarters held: 22; Since Q1 2021

Holdings of MPLX by Heronetta Management, L.P., by quarter
Quarter	Shares	Value	% of portfolio	Share change	Action	All holders
Q2 2026	324,039	$18.3M	16.8%	00.0%	Unchanged	Holders
Q1 2026	324,039	$18.5M	16.9%	+400+0.1%	Added	Holders
Q4 2025	323,639	$17.3M	10.0%	−32,425−9.1%	Reduced	Holders
Q3 2025	356,064	$17.8M	9.7%	00.0%	Unchanged	Holders
Q2 2025	356,064	$18.3M	10.2%	00.0%	Unchanged	Holders
Q1 2025	356,064	$19.1M	10.4%	+500+0.1%	Added	Holders
Q4 2024	355,564	$17.0M	9.7%	−2,800−0.8%	Reduced	Holders
Q3 2024	358,364	$15.9M	9.7%	00.0%	Unchanged	Holders
Q2 2024	358,364	$15.3M	9.8%	+1,300+0.4%	Added	Holders
Q1 2024	357,064	$14.8M	9.6%	−5,200−1.4%	Reduced	Holders
Q4 2023	362,264	$13.3M	9.4%	+24,400+7.2%	Added	Holders
Q3 2023	337,864	$12.0M	8.8%	+5,200+1.6%	Added	Holders
Q2 2023	332,664	$11.3M	8.3%	+595+0.2%	Added	Holders
Q1 2023	332,069	$11.4M	8.4%	−128,464−27.9%	Reduced	Holders
Q4 2022	460,533	$15.1M	9.5%	+22,796+5.2%	Added	Holders
Q3 2022	437,737	$13.1M	9.4%	+2,400+0.6%	Added	Holders
Q2 2022	435,337	$12.7M	8.9%	+14,200+3.4%	Added	Holders
Q1 2022	421,137	$14.0M	9.0%	+4,000+1.0%	Added	Holders
Q4 2021	417,137	$12.3M	9.4%	+4,500+1.1%	Added	Holders
Q3 2021	412,637	$11.7M	9.1%	+11,700+2.9%	Added	Holders
Q2 2021	400,937	$9.15M	8.0%	+9,900+2.5%	Added	Holders
Q1 2021	391,037	$10.0M	8.4%	–	–	Holders

Livermore's 13F data starts with Q1 2021, so Q1 2021 has no change from the previous quarter.